Despite the relationship between nasal obstruction and OSA, the therapeutic effect of improving nasal airway patency on OSA severity remains a point of conjecture [4]. In fact, administration of intranasal corticosteroids has been shown to improve sleepiness and reduce the apnoea/hypopnoea index (AHI) in patients with OSA and rhinitis [5], whereas in OSA patients with nasal obstruction the use of topical decongestants, external nasal dilators and nasal surgery has provided equivocal results [6].